M.C.
I would recommend ABC Pediatrics with Doctors Rick and Melanie Blumenthal. They are husband and wife pediatricians and have been so great with my two kids. We have been seeing them since our 2.5 year-old was 3 months old, and are using them for our newborn daughter. You hardly ever wait more than a few minutes to see the doctor, and because there are two of them (although Melanie only works part time because they have kids too), it is easy to get appointments at convenient times. One of the best things is that they have e-mail so you can ask non-urgent questions any time you like, and they usually get back to you within 24 hours.
Here is the info: ABC Pediatrics - 3772 W. Katella Ave, Ste 101
Los Alamitos, CA 90720
###-###-#### Web site: www.abcpediatrics.com
Good Luck, Shelley